[Ovmsdev] Another incident

[Chris Box]

On 2025-03-22 02:26, Michael Geddes wrote:

> How are we going with this investigation?

Good question. I've been quiet while I progressed the 12v theory. 
Currently the code only tracks average 12v, so I implemented code to 
also record the lowest 12v observed. This value is then reported as an 
MQTT metric, and also log entries are created every time it reaches a 
new low.

I observed this for a couple of weeks, and saw 12v dropping below 11.8 
while the average was still up at 12.6 or more:

With normal OVMS only the green line's metrics are reported. The yellow 
one is what I've added.

I then replaced the conventional lead acid with a new AGM, to benefit 
from its low internal resistance.

The difference can be seen clearly. The change happened on 12th March.

Since I've been using the AGM I haven't experienced a dashboard error. 
It's early days of course; time will tell.

Since the tracking of lowest 12v seems to be useful, I plan to create a 
PR for this part.

Chris
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